However, Princess Kate and as Queen Consort Camilla noticeably wore three - but what's the significance behind it? One theory is that the royals wear multiple brooches in honour of family members who have fought and died in wars.
Some people say a poppy should be worn on the left lapel, to keep it close to your heart – it is also the side that medals are worn by the Armed Forces. Others argue that the symbol should be displayed on the left by men and the right by women, the traditional positions of a badge or brooch.
Another theory is simply because a corsage of poppies is much more visible than one, while some theories suggest each poppy stands for a different branch of the military. The Princess of Wales' great-grandmother had three brothers who were killed in action during the First World War.
Wearing a poppy (on the left breast or lapel) is more common in Australia on and around Remembrance Day, 11 November.
The Poppy should be worn with respect on the left breast, close to the heart.
Some believe that men should wear their poppy on the left of their chest and women on the right, but the Royal British Legion say that the only rule is to “wear it with pride.” Some cars and buses also “wear” poppies, but it's not so common.
Even now, the factory employs disabled veterans to produce the wreaths for the Royal Family and the Royal British Legion's annual Poppy Appeal. Since 1924, wearing poppies has been a custom in the U.S. for honoring those who sacrificed their lives for the greater good.
The wearing of poppies in Northern Ireland is controversial. It is seen by many as a political symbol and a symbol of Britishness, representing support for the British Army. The poppy has long been the preserve of the unionist/loyalist community.
The reason royal ladies - who also include Queen Consort Camilla and the Princess of Wales - wear multiple poppies has never been confirmed by the palace. One theory is that they wear multiple brooches in honour of family members who have fought and died in wars.
The lapel Poppy should be worn during the Remembrance period, from the last Friday in October until November 11. The Legion encourages the wearing of Poppies at funerals of Veterans, and for any commemorative event such as a memorial service, or the anniversary of the Battle of Vimy Ridge.
In Australia, single poppies are not usually worn on ANZAC Day - the poppy belongs to Remembrance Day, 11 November. However, wreaths of poppies are traditionally placed at memorials and honour boards on ANZAC Day.
Purple poppy: To remember animal victims of war. The purple poppy is often worn to remember animals that have been victims of war. Animals like horses, dogs and pigeons were often drafted into the war effort, and those that wear the purple poppy feel their service should be seen as equal to that of human service.
So, what's the deal? According to the royal rule book, female members of The Firm must curtsy to the most senior members of the monarchy – currently King Charles and Queen Consort Camilla – whilst their male counterparts must bow their heads.
It has been widely speculated that the five poppies represent each service in the war – Army, Navy, RAF, Civil Defence and women.
"It has been assumed that the queen wears five poppies for the three branches of the military [the army, navy, and air force] plus women and the civil defense."
The issue is not a theological one, there is no Catholic Church rule to say we should not wear poppies or remember the military dead. For Catholics living here I would suggest it is different for historical reasons and because of all the “political baggage” that we attach to wearing a poppy.
Mr McClean has suffered abuse for the last decade for his decision not to wear the poppy because of the events of Bloody Sunday in his native Co Derry in 1972, when 13 people were shot to death by members of the British army during a civil rights march. A 14th person died later.
Other colours of poppy have their own meanings: - Pink poppies symbolise compassion and platonic love. - Orange poppies stand for health and regeneration. - Yellow poppies represent optimism and the ability to look on the bright side as well as positive memories of people who have died.
Often Royals will be expected to shake a lot of hands during funerals and large events, so this could be part of the reason that gloves were worn or taken by the women. Another reason is modesty - the Queen wore gloves partially because she wanted to ensure that no part of her arms were exposed.
I really can't explain what the feeling was when she did it, but it was really nice." When CNN correspondent Scott McLean asked the young girl why felt compelled to hug Meghan, she responded, "because I look up to her in some ways, and it just felt like it was the right thing to do."
However, Meghan's lack of adornment was not down to a fashion choice. The former Suits star didn't wear a brooch as all the other female family members are cadets or hold honorary positions with a base or squadron.
It is thought that the red of the petals represents the blood of those who gave their lives, the black button in the middle is for the mourning of those who never welcomed their loved ones home and the green leaf shows the hope that the grass and crops growing after the war brings.
Our red poppy is a symbol of both Remembrance and hope for a peaceful future. Poppies are worn as a show of support for the Armed Forces community. The poppy is a well-known and well-established symbol, one that carries a wealth of history and meaning with it.